U.S. Rep. Earl Blumenauer is demanding that the Pentagon explain how war contractor Kellogg, Brown and Root may have been granted immunity from harming any soldier or civilian in Iraq.

In a sharply worded letter Wednesday, Blumenauer gave the secretary of defense five days to produce details of KBR's claims of indemnification. The details of a secret agreement have emerged in a U.S. District Court case in Portland and were reported Tuesday in The Oregonian. Blumenauer said he plans to take his concerns to colleagues on the House Armed Services Committee.